Ó Riada, Sean
(1939-1971), Cork, Ireland. Includes biography, and selected works, from the Contemporary Music Centre, Ireland.
Oldham, Kevin
(1960-1993), Kansas City. Composer and pianist. Picture, biography, works, and discography.
Oliveira - Cartola, Angenor de
(1908-1980), Rio de Janeiro, Brazil. Brazilian composer. Pictures and biography, from Mangotree Music Productions.